Figure 7
From: Learning from microarray interlaboratory studies: measures of precision for gene expression
Within-round between-participant and repeatability precisions. This scatterplot displays 62108 repeatabilities for Round 1 data, sr 1, as a function of the between-participant precisions, sL1, and the average log2 signal, 
, for the Mix 1 and Mix 2 technical replicates. The one-third of probesets with the smallest are denoted green "-", the middle third are denoted blue "×", and one-third with the largest are denoted red "+". The labeled open circles denote the {sL1, sr 1} location of four exemplar probesets. The precisions are expressed as multiplicative standard deviations: a value of 1 indicates that the values are within a factor of 1 of their mean (i.e., they are identical) whereas a value of 5 indicates a 5-fold spread about their mean.